Hello…
I have already made a flat floor with 3 teapots, fog effect and key movements to move the front teapot up, down, left and right.
I wanted to have mouse movements to the front teapot so that clicking on the left mouse button rotate the front teapot by some angle and right button click rotates it anticlockwise.
In my code, the entire scene is rotated along with the floor and all the teapots.I just need the front teapot to rotate without changing the entire scene.
Please help me out with this problem?
Here is my code !!
#include <stdafx.h>
#include <stdlib.h>
#include <GL/glut.h>
#include <stdio.h>
#define checkImageWidth 128
#define checkImageHeight 128
static GLint fogMode;
static GLubyte checkImage[checkImageHeight][checkImageWidth][4];
static int flag = GL_TRUE;
GLfloat translation[2];
GLfloat spin;
float FogCol[3]={0.8f,0.8f,0.8f};
void drawCheckImage(void)
{
int i, j, c;
for (i = 0; i < checkImageHeight; i++) {
for (j = 0; j < checkImageWidth; j++) {
c = ((((i&0x8)==0)^((j&0x8))==0))*255;
checkImage[i][j][0] = (GLubyte) c;
checkImage[i][j][1] = (GLubyte) c;
checkImage[i][j][2] = (GLubyte) c;
checkImage[i][j][3] = (GLubyte) 255;
}
}
glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_NEAREST);
glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_NEAREST);
glTexImage2D(GL_TEXTURE_2D, 0, GL_RGBA, checkImageWidth, checkImageHeight,
0, GL_RGBA, GL_UNSIGNED_BYTE, checkImage);
glFrontFace (GL_CW);
}
static void init(void)
{
translation[0]=0.0;
translation[1]=0.0;
spin=0.0;
glClearColor (0.0, 0.0, 0.0, 0.0);
glShadeModel(GL_SMOOTH);
glEnable(GL_DEPTH_TEST);
drawCheckImage();
glEnable(GL_LIGHTING);
glEnable(GL_LIGHT0);
glLightModeli(GL_LIGHT_MODEL_TWO_SIDE,0);
glEnable(GL_COLOR_MATERIAL);
float black[4]={0,0,0,0};
glMaterialfv(GL_FRONT,GL_AMBIENT,black);
glMaterialfv(GL_FRONT,GL_SPECULAR,black);
}
static void renderTeapot (GLfloat x, GLfloat y, GLfloat z)
{
glPushMatrix();
glTranslatef (x, y, z);
glutSolidTeapot(1.8);
glPopMatrix();
}
void reshape(int w, int h)
{
glViewport(0, 0,(GLsizei) w,(GLsizei) h);
glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluPerspective(45.0, (float) w/(float) h, 1.0, 200.0);
glMatrixMode(GL_MODELVIEW);
glLoadIdentity();
glTranslatef(0.0, 0.0, -40.0f);
glRotatef(30, 1, 0, 0);
}
void display(void)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glDisable(GL_TEXTURE_2D);
glColor3f(0.4,0.0,0.8);
renderTeapot ((-5.0+translation[0]), (0.8+translation[1]), 5.0);
glRotatef (spin, 1.0, 0.0, 0.0);
glColor3f(0.1,0.5,0.3);
renderTeapot (0, 0.8, -5.0);
glColor3f(0.6,0.0,0.0);
renderTeapot (5, 0.8, -15.0);
glEnable(GL_TEXTURE_2D);
glTexEnvf(GL_TEXTURE_ENV, GL_TEXTURE_ENV_MODE, GL_DECAL);
glColor3f(0.1, 0.1, 0.1);
glBegin(GL_QUADS);
glNormal3f(0, 1, 0);
glTexCoord2f(0, 0);
glVertex3f(-17.0, 0, 22.0);
glTexCoord2f(0, 1);
glVertex3f(-17.0, 0, -22.0);
glTexCoord2f(1, 1);
glVertex3f(17.0, 0, -22.0);
glTexCoord2f(1, 0);
glVertex3f(17.0,0, 22.0);
glEnd();
if (flag) {
glEnable(GL_FOG);
{
GLfloat fogColor[4] = {0.8, 0.8, 0.8, 1.0};
fogMode = GL_EXP;
glFogi (GL_FOG_MODE, fogMode);
glFogfv (GL_FOG_COLOR, fogColor);
glFogf (GL_FOG_DENSITY, 0.03);
glHint (GL_FOG_HINT, GL_DONT_CARE);
glClearColor (0.7, 0.7, 0.7, 1.0);
}
}
else
{
glDisable(GL_FOG);
glClearColor(0.0, 0.0, 0.0, 0.0);
}
glutSwapBuffers();
}
void keyboard(unsigned char key, int x, int y)
{
switch (key) {
case ‘f’:
case ‘F’:
flag = !flag;
glutPostRedisplay();
break;
case 27:
exit(0);
break;
default:
break;
}
}
void special(int key, int x, int y)
{
switch (key) {
case GLUT_KEY_LEFT:
translation[0]= translation[0]+(-1.0);
glutPostRedisplay();
break;
case GLUT_KEY_RIGHT:
translation[0]= translation[0]+(1.0);
glutPostRedisplay();
break;
case GLUT_KEY_UP:
translation[1]= translation[1]+(1.0);
glutPostRedisplay();
break;
case GLUT_KEY_DOWN:
translation[1]= translation[1]+(-1.0);
glutPostRedisplay();
break;
}
}
void mouse(int button, int state, int x, int y)
{
switch (button) {
case GLUT_LEFT_BUTTON:
spin = (spin + 20.0);
glutPostRedisplay();
break;
case GLUT_RIGHT_BUTTON:
spin = (spin - 20.0);
glutPostRedisplay();
break;
}
}
int main(int argc, char** argv)
{
glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DOUBLE | GLUT_RGB | GLUT_DEPTH);
glutInitWindowSize(750, 750);
glutInitWindowPosition(100,100);
glutCreateWindow(argv[0]);
init();
glutReshapeFunc(reshape);
glutDisplayFunc(display);
glutSpecialFunc(special);
glutKeyboardFunc (keyboard);
glutMouseFunc(mouse);
glEnable(GL_DEPTH_TEST);
glutMainLoop();
return 0;
}
